Change record status: 
Project: 
Introduced in branch: 
9.3.x
Introduced in version: 
9.3.0
Description: 

Historically, shortcut icons (also known as favicons) were embedded in HTML as follows:

<link rel="shortcut icon" href="favicon.ico">

This is now considered technically incorrect according to the HTML spec, and from Drupal 9.3.0 shortcut icons will be embedded as follows:

<link rel="icon" href="favicon.ico">
Impacts: 
Site builders, administrators, editors
Themers
Updates Done (doc team, etc.)
Online documentation: 
Not done
Theming guide: 
Not done
Module developer documentation: 
Not done
Examples project: 
Not done
Coder Review: 
Not done
Coder Upgrade: 
Not done
Other: 
Other updates done